Neptune is an evening star, whereas Uranus is a morning star
Indicate whether the statement is true or false
False
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The allowed shapes for the orbits of objects responding only to the force of gravity are
A) ellipses, parabolas, and hyperbolas. B) ellipses only. C) ellipses, spirals, and parabolas. D) circles and ellipses.
What is the diameter of the galaxy, in km?
A) about 1 billion trillion km (1021 km) B) about 10 trillion km (1013 km) C) about 1 million trillion km (1018 km) D) about 100,000 km (105 km)
Which of the following is not evidence for dark matter?
A) gravitational lensing around galaxy clusters B) X-ray observations of hot gas in galaxy clusters C) the broad absorption lines found in the spectra of elliptical galaxies D) the flat rotation curves of spiral galaxies E) the expansion of the universe
Fresnel lenses are
a. made of mirror segments b. made of the surface portions of a regular lens c. found in some auto headlamps and theater lights and rear windows of RVs d. all of the above